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If $\alpha,\beta,\mu$ are roots of $2x^3-x^2+1=0$, the equation whose roots are $\alpha+1$, $\beta+1$, $\mu+1$ is found by:
Amultiplying every root by 1 and re-expanding
Breplacing $x$ with $x+1$ in the original equation
Cadding 1 to every coefficient of the equation
Dreplacing $x$ with $x-1$ in the original equation
Answer & Solution
Correct answer: D. replacing $x$ with $x-1$ in the original equation
1. Let $y=x+1$ be the new root, so each new root exceeds an old root by 1.
2. Rearranging gives $x=y-1$, expressing the old variable through the new one.
3. Substituting $x=y-1$ into $2x^3-x^2+1=0$ produces the equation satisfied by $y$.
4. In terms of the original letter that is the substitution $x\to x-1$.
5. Substituting $x+1$ instead shifts the roots down by 1; adding 1 to each coefficient changes the equation arbitrarily.
_Source: NECTA ACSEE 2023 Advanced Mathematics 142/2, Question 6: Algebra_
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